Core data iOS错误：无法识别的选择器发送到实例0x6ea9090

我使用核心数据来建立我的所有实体。但是，当我尝试创建一个新的客户实体并将其发送到modal addCustomer view controller时，我总是会遇到这个错误

*由于未捕获异常而终止应用程序 “NSInvalidArgumentException”，原因：'-[UINavigationController setCustomer:：无法识别的选择器已发送到实例0x8854700'

当程序在prepareForSegue中访问addController.customer=newCustomer时，AccountListTableViewController.m中发生错误

代码如下：

AccountListTableViewController.h

#import <UIKit/UIKit.h>
#import "CustomerAddViewController.h"
@class Customer;


@interface AccountListTableViewController : UITableViewController <CustomerAddDelegate, NSFetchedResultsControllerDelegate> {
@private
    NSFetchedResultsController *fetchedResultsController;
    NSManagedObjectContext *managedObjectContext;

}

@property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController;
@property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;



@end

#import <UIKit/UIKit.h>
#import "Customer.h"
@class Customer;
@protocol CustomerAddDelegate;

@interface CustomerAddViewController : UITableViewController{

    Customer *customer;

    UITextField *firstName;
    UITextField *lastName;
    UITextField *address;
    UITextField *city;
    UITextField *state;
    UITextField *zip;
    UITextField *homePhone;
    UITextField *cellPhone;
    UITextField *email;
    id <CustomerAddDelegate> delegate;

}
@property (nonatomic, strong) Customer *customer;

@property (nonatomic, strong) IBOutlet UITextField *firstName;
@property (nonatomic, strong) IBOutlet UITextField *lastName;
@property (nonatomic, strong) IBOutlet UITextField *address;
@property (nonatomic, strong) IBOutlet UITextField *city;
@property (nonatomic, strong) IBOutlet UITextField *state;
@property (nonatomic, strong) IBOutlet UITextField *zip;
@property (nonatomic, strong) IBOutlet UITextField *homePhone;
@property (nonatomic, strong) IBOutlet UITextField *cellPhone;
@property (nonatomic, strong) IBOutlet UITextField *email;

@property (nonatomic, strong) id <CustomerAddDelegate> delegate;

- (IBAction) saveCustomer;
- (IBAction) cancel;
@end

@protocol CustomerAddDelegate <NSObject>

-(void)customerAddViewController:(CustomerAddViewController *)customerAddViewController didAddCustomer:(Customer *)customer;

@end

#导入
#导入“CustomerAddViewController.h”
@类别客户；
@接口AccountListTableViewController:UITableViewController{
@私人的
NSFetchedResultsController*fetchedResultsController；
NSManagedObjectContext*managedObjectContext；
}
@属性（非原子，保留）NSFetchedResultsController*fetchedResultsController；
@属性（非原子，保留）NSManagedObjectContext*managedObjectContext；
@结束

AccountListTableViewController.m

#import "AccountListTableViewController.h"
#import "AccountListCell.h"
#import "Customer.h"
#import "AppDelegate.h"



@implementation AccountListTableViewController

@synthesize managedObjectContext, fetchedResultsController;

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    if ([[segue identifier] isEqualToString:@"AddAccountSegue"] ) {
        CustomerAddViewController *addController = [segue destinationViewController];
        addController.delegate = self;

        Customer *newCustomer = [NSEntityDescription insertNewObjectForEntityForName:@"Customer" inManagedObjectContext:self.managedObjectContext];
        addController.customer = newCustomer;
    }
}

-(void)customerAddViewController:(CustomerAddViewController *)customerAddViewController didAddCustomer:(Customer *)customer{
    [self dismissModalViewControllerAnimated:YES];
}

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{

    //I added this to keep from crashing
    if (managedObjectContext == nil) 
    { 
        managedObjectContext = [(AppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; 
        NSLog(@"After managedObjectContext: %@",  managedObjectContext);
    }
    [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
//#warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
    // Return the number of rows in the section.
    id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section];

    return [sectionInfo numberOfObjects];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    //Customer *customer = [self.fetchedResultsController objectAtIndexPath:indexPath];

    AccountListCell *cell = [tableView dequeueReusableCellWithIdentifier:@"AccountCellReuseIdentifier"];
    Customer *aCustomer = (Customer *)[fetchedResultsController objectAtIndexPath:indexPath];
    cell.customer = aCustomer;

//    static NSString *CellIdentifier = @"Cell";
//    
//    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//    if (cell == nil) {
//        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
//    }

    // Configure the cell...

    return cell;
}

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     */
}

- (NSFetchedResultsController *)fetchedResultsController {
    // Set up the fetched results controller if needed.
    if (fetchedResultsController == nil) {
        // Create the fetch request for the entity.
        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
        // Edit the entity name as appropriate.
        NSEntityDescription *entity = [NSEntityDescription entityForName:@"Customer" inManagedObjectContext:managedObjectContext];
        [fetchRequest setEntity:entity];

        // Edit the sort key as appropriate.
        NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"lastName" ascending:YES];
        NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];

        [fetchRequest setSortDescriptors:sortDescriptors];

        // Edit the section name key path and cache name if appropriate.
        // nil for section name key path means "no sections".
        NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:nil cacheName:@"Root"];
        aFetchedResultsController.delegate = self;
        self.fetchedResultsController = aFetchedResultsController;

//        [aFetchedResultsController release];
//        [fetchRequest release];
//        [sortDescriptor release];
//        [sortDescriptors release];
    }

    return fetchedResultsController;
}    


/**
 Delegate methods of NSFetchedResultsController to respond to additions, removals and so on.
 */

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
    // The fetch controller is about to start sending change notifications, so prepare the table view for updates.
    [self.tableView beginUpdates];
}


- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {
    UITableView *tableView = self.tableView;

    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

//      case NSFetchedResultsChangeUpdate:
//          [self configureCell:(AccountListCell *)[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
//          break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}


- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}


- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    // The fetch controller has sent all current change notifications, so tell the table view to process all updates.
    [self.tableView endUpdates];
}

@end

#导入“AccountListTableViewController.h”
#导入“AccountListCell.h”
#导入“Customer.h”
#导入“AppDelegate.h”
@实现AccountListTableViewController
@综合managedObjectContext、fetchedResultsController；
-（void）prepareForSegue:（UIStoryboardSegue*）segue发送方：（id）发送方{
if（[[segue identifier]IsequalString:@“AddAccountSegue”]）{
CustomerAddViewController*addController=[segue destinationViewController]；
addController.delegate=self；
Customer*newCustomer=[NSEntityDescription insertNewObjectForEntityForName:@“Customer”在managedObjectContext:self.managedObjectContext]中；
addController.customer=newCustomer；
}
}
-（无效）customerAddViewController:（customerAddViewController*）customerAddViewController didAddCustomer:（Customer*）Customer{
[自我解散Modalviewcontrolleranimated:是]；
}
-（id）initWithStyle:（UITableViewStyle）样式
{
self=[super initWithStyle:style]；
如果（自我）{
//自定义初始化
}
回归自我；
}
-（无效）未收到记忆警告
{
//如果视图没有superview，则释放该视图。
[超级记忆警告]；
//释放所有未使用的缓存数据、图像等。
}
#pragma标记-视图生命周期
-（无效）viewDidLoad
{
//我添加这个是为了防止崩溃
if（managedObjectContext==nil）
{ 
managedObjectContext=[（AppDelegate*）[[UIApplication sharedApplication]委托]managedObjectContext]；
NSLog（@“在managedObjectContext之后：%@”，managedObjectContext）；
}
[超级视图下载]；
//取消对下一行的注释以保留演示文稿之间的选择。
//self.clearselectiononviewwillappear=否；
//取消对以下行的注释，以在此视图控制器的导航栏中显示编辑按钮。
//self.navigationItem.rightBarButtonItem=self.editButtonItem；
}
-（无效）视图卸载
{
[超级视频下载]；
//释放主视图的所有保留子视图。
//例如，self.myOutlet=nil；
}
-（无效）视图将显示：（BOOL）动画
{
[超级视图将显示：动画]；
}
-（无效）视图显示：（BOOL）动画
{
[超级视图显示：动画]；
}
-（无效）视图将消失：（BOOL）已设置动画
{
[超级视图将消失：动画]；
}
-（无效）视图消失：（BOOL）已设置动画
{
[超级视窗消失：动画]；
}
-（布尔）应自动旋转指针面定向：（UIInterfaceOrientation）interfaceOrientation
{
//对于支持的方向返回YES
返回（interfaceOrientation==UIInterfaceOrientationGraphic）；
}
#pragma标记-表视图数据源
-（NSInteger）表格视图中的节数：（UITableView*）表格视图
{
//#警告：方法实现可能不完整。
//返回节数。
返回1；
}
-（NSInteger）表视图：（UITableView*）表视图行数节：（NSInteger）节
{
//#警告：方法实现不完整。
//返回节中的行数。
id sectionInfo=[[self.fetchedResultsController节]objectAtIndex:section]；
返回[sectionInfo numberOfObjects]；
}
-（UITableViewCell*）tableView:（UITableView*）tableView cellForRowAtIndexPath:（NSIndexPath*）indexPath
{
//Customer*Customer=[self.fetchedResultsController对象索引路径：indexath]；
AccountListCell*单元格=[tableView dequeueReusableCellWithIdentifier:@“AccountCellReuseIdentifier”]；
Customer*aCustomer=（Customer*）[fetchedResultsController对象索引路径：indexPath]；
cell.customer=aCustomer；
//静态NSString*CellIdentifier=@“Cell”；
//    
//UITableViewCell*单元格=[tableView dequeueReusableCellWithIdentifier:CellIdentifier]；
//如果（单元格==nil）{
//cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault重用标识符：CellIdentifier]；
//    }
//配置单元格。。。
返回单元；
}
/*
//替代以支持表视图的条件编辑。
-（BOOL）tableView:（UITableView*）tableView caneditrowatinexpath:（nsindepath*）indepath
{
//如果不希望指定的项可编辑，则返回“否”。
返回YES；
}
*/
/*
//替代以支持编辑表格视图。
-（void）tableView:（UITableView*）tableView提交的编辑样式：（UITableViewCellEditingStyle）行的编辑样式索引路径：（NSIndexPath*）索引路径
{
如果（editingStyle==UITableViewCellEditingStyleDelete）{
//从数据源中删除该行
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]和RowAnimation:UITableViewRowAnimationFade]；
}   
else if（editingStyle==UITableViewCellEditingStyleInsert）{
//创建相应类的新实例，将其插入数组，并向表视图添加新行
}   
}
*/
/*
//替代以支持重新排列表视图。
-（void）tableView:（UITableView*）tableView moveRowAtIndexPath:（NSIndexPat）
#define NAME 0
#define ADDRESS 1
#define CONTACT 2
#import "CustomerAddViewController.h"
#import "Customer.h"


@implementation CustomerAddViewController

@synthesize firstName, lastName, address, city, state, zip, homePhone, cellPhone, email, customer, delegate;

//- (id)initWithStyle:(UITableViewStyle)style
//{
//    self = [super initWithStyle:style];
//    if (self) {
//        // Custom initialization
//    }
//    return self;
//}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
   // [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source

//This stuff not needed because we are setting static sections and rows in storyboard

//- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
//{
//    return 3;
//}
//
//- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
//{
//    NSInteger rows = 0;
//    switch (section) {
//        case NAME:
//            rows = 2;
//            break;
//        case ADDRESS:
//            rows = 4;
//            break;
//        case CONTACT:
//            rows = 3;
//            break;
//    }
//
//    return rows;
//}

//- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
//{
//    static NSString *CellIdentifier = @"Cell";
//    
//    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//    if (cell == nil) {
//        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
//    }
//    
//    // Configure the cell...
//    
//    return cell;
//}

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     */
}

@end

CustomerAddViewController *addController = [segue destinationViewController];

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"AddAccountSegue"])        
    {
        UINavigationController *navigationController = segue.destinationViewController;
        CustomerAddViewController *addController = (id)[[navigationController viewControllers] objectAtIndex:0];
        [addController setCustomer:yourObject];
    }
}